We are the weakest link. These days, criminals aren't just hacking networks. They're hacking us, the employees.

What's a Company's Biggest Security Risk? You.

Hacking attacks against companies are growing bigger and bolder—witness a string of high-profile breaches this year at Sony Corp., Citigroup Inc. and others. But gone are the days when hackers would simply find holes in corporate networks to steal valuable data. Large companies have grown wise to the threat of hacking, and have spent the past 30 years hardening the perimeters of their networks with upgraded technology.